CN114472978A

CN114472978A - Drilling machine

Info

Publication number: CN114472978A
Application number: CN202111232617.2A
Authority: CN
Inventors: 伊原稔
Original assignee: Sugino Machine Ltd
Current assignee: Sugino Machine Ltd
Priority date: 2020-10-28
Filing date: 2021-10-22
Publication date: 2022-05-13
Anticipated expiration: 2041-10-22
Also published as: JP6994099B1; KR20220056799A; US20220126373A1; EP3991894A1; JP2022071706A; CN114472978B; KR102596729B1

Abstract

The invention provides a drilling machine, which comprises: a main shaft (31); a spindle motor (41); a frame (11) having: a linear motion guide support plate (11a) having a reference surface (11g), a motor support portion (11c), and a punch support plate (11b) having a first punch guide hole (11f), disposed at the front end of the linear motion guide support plate (11a), and having a height lower than that of the motor support portion (11 c); a linear motion guide (15) disposed on the reference surface (11 g); a slider (17) having a nut mounting hole (17b) and capable of reciprocating along the translation guide (15) and having substantially the same height as the motor support section (11 c); a punch (27) that penetrates the first punch guide hole (11 f); a feed screw (19) having: a screw shaft (19a) supported by the rear end of the motor support part (11c) and the front end as a free end, and a nut (19b) fastened to the nut mounting hole (17 b); and a feed motor (25) connected to the screw shaft (19 a).

Description

Drilling machine

Technical Field

The invention relates to a drilling machine.

Background

An electric machining apparatus is known which machines a workpiece with a tool that is advanced and retracted by rotation of a motor (japanese patent No. 3792451). The conventional electric machining apparatus includes: hollow frame, ram (ram ), ball screw (ball screw), linear bearing and screw support (screw support). The punch is held in a hole formed in the frame so as to be movable forward and backward, and has a spindle to which a tool is attached and which rotates at a tip end portion. The ball screw is rotatably supported in the frame in parallel with the punch. The linear bearing has a guide rail and a slider. The guide rail is fixed in the frame in parallel with the punch. The slider is movably supported on the guide rail. The screw support has: a fixing portion, a locking portion and a nut portion. The fixing part is arranged in the frame in a mode of advancing and retreating and is fixed on the sliding block. The locking part locks the base end part of the punch. The nut portion is screwed with the ball screw.

Disclosure of Invention

The invention aims to provide a drilling machine which is simple and convenient to manufacture and high in feeding precision.

A first aspect of the present invention is a drill including:

a main shaft extending in a horizontal direction;

a spindle motor for driving the spindle;

a frame having a box shape with an open upper portion, the frame comprising:

a linear motion guide support plate having a reference surface formed by cutting;

a motor support part disposed at a rear end of the translational guide support plate; and

a punch support plate having a first punch guide hole, disposed at a front end of the linear guide support plate, and having a height lower than the motor support portion;

a linear motion guide disposed on the reference surface;

a slider which is capable of reciprocating along the linear motion guide, has a nut mounting hole at an upper portion thereof, has a lower end portion connected to the linear motion guide, and has substantially the same height as the motor support portion;

a punch which penetrates the first punch guide hole and is fastened to a front surface of the slider;

a feed screw having:

a screw shaft having a rear end supported by the motor support portion and a front end serving as a free end, and disposed above the punch; and

a nut fastened to the nut mounting hole; and

and a feed motor fixed to the motor support part and connected to the screw shaft.

The first fitting portion and the second fitting portion are, for example, cylindrical surfaces. The first fitting portion is disposed to protrude from one end portion of the punch support plate, for example. The second fitting portion is, for example, a bottomed hole disposed in the punch guide (ram guide, hammer guide, outer cylinder).

The punch is connected to a central portion of the slider. The punch is supported by the second punch guide hole.

The screw shaft penetrates through the motor supporting part. The screw shaft and the output shaft of the feed motor may be coaxially connected via a coupling.

The main shaft can also be a hollow structure.

The spline shaft and the spline hole are disposed coaxially with the main shaft. The spline shaft extends inside the main shaft. The spline shaft penetrates through the motor supporting part. The spline shaft and the output shaft of the spindle motor may also be coaxially connected via a coupling.

The slider may have a nut mounting hole. The nut mounting hole may be arranged with sufficient clearance with respect to the nut.

The adjusting jig is mounted on the frame when the nut is fastened to the slider. The adjustment jig is adjusted so that the screw shaft and the linear motion guide become parallel to each other.

According to the present invention, a drilling machine with simple manufacturing and high feeding precision can be provided.

Drawings

Fig. 1 is a perspective view of a drilling machine of an embodiment.

Fig. 2 is a longitudinal sectional view of the drill of the embodiment.

Fig. 3 is a perspective view showing an adjustment method of the drill according to the embodiment.

Fig. 4 is a longitudinal sectional view showing an adjusting method of the drill according to the embodiment.

Description of the symbols

11 frame

15 direct-acting guide

17 sliding block

19 feed screw

25 feed motor

27 punch

31 spindle

33a splined hole

33b spline shaft

41 spindle

Detailed Description

As shown in fig. 1 and 2, the drill 10 includes: the linear motion guide device comprises a frame 11, a linear motion guide 15, a slide block 17, a feed screw 19, a bearing 21, a coupling 23, a feed motor 25, a punch 27, a main bearing 29, a main shaft 31 and a main shaft motor 41.

Preferably, the drill 10 has: spline 33, bearing 37, punch guide 35, coupler 39, feed motor mounting base 24, spindle motor mounting base 40, and adjustment jig 45.

Fig. 2 is a sectional view cut by a plane passing through central axes of the main shaft 31 and the feed screw 19.

The frame 11 has a drive chamber 13. The frame 11 has a box shape with an open upper portion. The frame 11 has: a linear guide support plate 11a, a punch support plate 11b, a motor support portion 11c, and a side plate 11 d. For convenience, the opening of the driving chamber 13 is referred to as an upper side, and the feeding direction of the punch 27 is referred to as a front side.

The linear guide support plate 11a has a reference surface 11g on the upper surface.

The punch support plate 11b is disposed upright on one end (front end) of the linear guide support plate 11 a. The punch support plate 11b has a first fitting portion 11e and a first punch guide hole 11 f. The first fitting portion 11e and the first punch guide hole 11f are coaxial. The first punch guide hole 11f is, for example, a cylindrical hole, and penetrates the punch support plate 11 b. The first fitting portion 11e is cylindrical and is provided on the outer surface of the frame 11.

The motor support portion 11c is plate-shaped and is disposed upright on the other end (rear end) of the linear guide support plate 11 a. The motor support portion 11c protrudes above the punch support plate 11b and the side plate 11 d.

The side plate 11d connects the translation guide support plate 11a, the punch support plate 11b, and the motor support portion 11 c.

The frame 11 may be integrally constructed by a linear guide support plate 11a, a punch support plate 11b, a motor support portion 11c, and a side plate 11 d.

The linear guide 15 is a so-called linear guide. The linear guide 15 has a guide rail 15a and a guide block 15 b. The guide rail 15a is fixed to the reference surface 11g inside the drive chamber 13. The guide rail 15a extends forward and rearward. The guide block 15b reciprocates on the guide rail 15 a.

The slider 17 has a rectangular shape and has a spline passage hole 17a and a nut attachment hole 17 b. The slider 17 is connected to the guide block 15b at a lower end (first end). The slider 17 has the same height as the motor support portion 11 c.

The spline passage hole 17a is disposed at the lower portion of the slider 17 and penetrates the slider 17 in the front-rear direction. The nut mounting hole 17b is disposed at an upper portion (second end portion side) of the slider 17, and penetrates the slider 17 in the front-rear direction. The slider 17 moves integrally with the guide block 15 b.

The punch 27 is inserted into the first punch guide hole 11f and fastened to the central portion of the slider 17. The punch 27 is hollow, for example, cylindrical. The punch 27 is disposed parallel to the guide rail 15 a. Preferably, the punch 27 slides in the first punch guide hole 11 f.

The main shaft 31 is supported by the punch 27 via the main bearing 29. A rotary tool (not shown) is disposed at the tip of the spindle 31. The rotary tool is, for example, a drill or a tap. The main shaft 31 is a hollow structure.

The spline 33 has a spline hole 33a and a spline shaft 33 b. The spline hole 33a is disposed coaxially with the main shaft 31 at the rear end of the main shaft 31. The spline shaft 33b is supported by the motor supporting portion 11c via a bearing 37. The spline shaft 33b is inserted into the spline hole 33 a. The spline shaft 33b extends inside the main shaft 31. The spline shaft 33b penetrates the motor support portion 11c and protrudes rearward of the motor support portion 11 c.

The spindle motor mounting base 40 is, for example, a hollow prism shape, and is detachably disposed on the motor support portion 11 c. The length of the spindle motor mounting base 40, the fitting to the spindle motor 41, the mounting shape of the mounting screw, and the like can be designed according to the mounting shape of the spindle motor 41.

The spindle motor 41 is fixed to the motor support portion 11c via a spindle motor mounting base 40. The spindle motor 41 is preferably a servo motor, and is a PM synchronous motor. An output shaft of the spindle motor 41 is fastened to the spline shaft 33b by a coupling 39. Preferably, the spindle motor 41 is numerically controlled.

Further, the spline 33, the spline passage hole 17a, the bearing 37, the coupling 39, and the spindle motor mounting base 40 may be omitted, and the spindle motor 41 may be disposed inside the punch 27. In this case, the output shaft of the spindle motor 41 may be connected directly to the spindle 31 or via a coupling. The output shaft of the spindle motor 41 may be integrated with the spindle 31.

The feed screw 19 has a screw shaft 19a and a nut 19 b. The feed screw 19 is preferably a ball screw. The feed screw 19 preferably has a cylindrical portion 19 c. The nut 19b is fastened to the nut mounting hole 17 b. The screw shaft 19a is disposed above the punch 27 in parallel with the guide rail 15 a. One end (rear end) of the screw shaft 19a is supported by the motor support portion 11c via a bearing 21. The other end (front end) of the screw shaft 19a is a free end. The screw shaft 19a is supported by a cantilever. The rear end of the screw shaft 19a penetrates the motor support portion 11c and protrudes rearward of the motor support portion 11 c. The nut 19b is smaller than the nut mounting hole 17 b. A sufficient clearance can be provided between the nut 19b and the nut attachment hole 17 b. The cylindrical portion 19c is coaxial with the screw shaft 19a and is disposed at the tip of the screw shaft 19 a.

The feed motor mounting base 24 is, for example, a hollow prism shape, and is detachably disposed on the motor support portion 11 c. The length of the feed motor mounting base 24, the fitting to the feed motor 25, the mounting shape of the lead screw, and the like can be designed according to the mounting shape of the feed motor 25.

The feed motor 25 is fixed to the motor support portion 11c via the feed motor mounting base 24. The feed motor 25 is preferably a servo motor, which is a PM synchronous motor. An output shaft of the feed motor 25 is fastened to the screw shaft 19a by a coupling 23. Preferably, the feed motor 25 is numerically controlled.

The punch guide 35 has a second fitting portion 35a and a second punch guide hole 35 b. The punch guide 35 is disposed on the front outer side of the punch support plate 11 b. The second fitting portion 35a is a cylindrical hole, and preferably fits with the first fitting portion 11e with a clearance. The second punch guide hole 35b penetrates the punch guide 35. Preferably, the second punch guide hole slides with the punch 27.

As shown in fig. 3 and 4, the adjustment jig 45 includes: a third fitting portion 45a, a punch passing hole 45b, and a fourth fitting portion 14 c. The adjusting jig 45 may have a reference surface 45 d. The third fitting portion 45a is a cylindrical hole and is fitted to the first fitting portion 11 e. The punch 27 passes through the punch passage hole 45 b. Preferably, the punch passing hole 45b is larger than the punch 27 to such an extent that the punch 27 can pass with a sufficient clearance. The fourth fitting portion 14c is a cylindrical hole and is fitted to the cylindrical portion 19 c. The reference surface 45d is parallel to a plane passing through the central axes of the third fitting portion 45a and the fourth fitting portion 14 c. The adjustment jig 45 may also be positioned on the frame 11 by a pin.

The adjustment jig 45 holds the screw shaft 19a parallel to the guide rail 15a when fastening the nut 19b to the nut attachment hole 17 b. In a state where the punch guide 35 is removed, the adjustment jig 45 is attached to the frame 11. The adjustment jig 45 is adjusted so that the reference surface 45d is located at the correct position. After the nut 19b is fastened to the nut attachment hole 17b, the adjustment jig 45 is removed. The punch guide 35 is attached to the frame 11.

Hereinafter, a method of using the drill 10 will be described. The rotation of the spindle motor 41 is transmitted to the spindle 31 via the spline 33. When the feed motor 25 rotates, the slider 17 and the punch 27 are integrally fed through the feed screw 19. The rotary tool attached to the spindle 31 machines an object.

The drill 10 is also capable of tapping by reversing the feed and return rotation.

The front end of the screw shaft 19a is a free end. Therefore, the height of the punch support plate 11b can be as low as the height of the upper surface of the punch guide 35. The reference surface 11g is produced by putting a tool (for example, an end mill) in a direction perpendicular to the reference surface 11g and cutting the tool. Since the height of the punch support plate 11b is low, the cutting tool is less likely to interfere with the punch support plate 11b, and the reference surface 11g is easily cut. This is because the amount of protrusion of the tool can be reduced when the reference surface 11g is cut. When the protrusion amount of the tool is increased, the tool such as an end mill is easily deflected by cutting resistance, and it is difficult to perfectly finish the reference surface 11 g. In contrast, by reducing the amount of protrusion of the tool, the reference surface 11g can be cut quickly and accurately.

When the tip of the screw shaft 19a is a free end, the screw shaft 19a is likely to vibrate. However, the screw shaft 19a is supported by a nut 19b fastened to an upper end portion of the slider 17. In addition, the lower end of the slider 17 is supported by the linear motion guide 15. Therefore, even if the tip of the screw shaft 19a is a free end, the influence on the feed accuracy of the main shaft 31 is small.

The drill 10 according to the embodiment can be easily manufactured and can maintain high feeding accuracy by the above-described structure.

The feed motor 25 is provided on the detachable feed motor mounting base 24. Therefore, the mounting shape of the feed motor 25 can be easily changed.

The spindle motor 41 is disposed outside the frame 11. Therefore, the spindle motor 41 can be easily changed. Further, a spindle motor 41 is provided on the detachable spindle motor mounting base 40. This makes it possible to easily change the mounting shape of the spindle motor 41 to a different shape.

For example, if the main shaft 31 is provided in the horizontal direction, when the punch 27 is fed forward, the front end of the punch 27 is inclined downward by the gravity acting on the punch 27. Here, since the first fitting portion 11e and the second fitting portion 35a are in clearance fit, the punch guide 35 can move in the vertical and horizontal directions by the clearance of fitting. Therefore, the inclination of the punch 27 can be adjusted within the limit of the movement of the punch guide 35.

The slider 17 is supported on the linear motion guide 15. The punch 27 is supported by the slider 17, the first punch guide hole 11f, and the second punch guide hole 35b at three points. Since the punch 27 is supported by three points, the punch 27 is not easily deflected.

The cylindrical portion 19c is disposed on the threaded shaft 19 a. Therefore, the screw shaft 19a can be easily adjusted to be parallel to the guide rail 15a by the adjustment jig 45.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention, and all technical matters included in the technical idea described in the claims are intended to be the objects of the present invention. While the above embodiments have been described as suitable examples, those skilled in the art will be able to realize various alternatives, modifications, variations and improvements based on the disclosure of the present specification, and such alternatives, modifications, variations and improvements are included in the technical scope of the appended claims.

Claims

1. A drilling machine is characterized by comprising:

a main shaft (31), the main shaft (31) extending in a horizontal direction;

a spindle motor (41), the spindle motor (41) driving the spindle (31);

a frame (11), wherein the frame (11) is in a box shape with an open upper part, and comprises:

a linear motion guide support plate (11a), the linear motion guide support plate (11a) having a reference surface (11g) produced by cutting;

a motor support portion (11c), the motor support portion (11c) being disposed at a rear end of the linear motion guide support plate (11 a); and

a punch support plate (11b) having a first punch guide hole (11f), disposed at the front end of the linear guide support plate (11a), and having a height lower than the motor support portion (11 c);

a linear motion guide (15), wherein the linear motion guide (15) is arranged on the reference surface (11 g);

a slider (17) that can reciprocate along the linear motion guide (15), wherein the slider (17) has a nut mounting hole (17b) at the upper part thereof, has the lower end part thereof connected to the linear motion guide (15), and has substantially the same height as the motor support part (11 c);

a punch (27), the punch (27) penetrating the first punch guide hole (11f) and being fastened to the front surface of the slider (17);

a feed screw (19), the feed screw (19) having:

a screw shaft (19a), the screw shaft (19a) having a rear end supported by the motor support portion (11c) and a front end as a free end, and being disposed above the punch (27); and

a nut (19b), the nut (19b) being fastened to the nut mounting hole (17 b); and

a feed motor (25), wherein the feed motor (25) is fixed on the motor support part (11c) and is connected with the screw shaft (19 a).

2. The drilling machine of claim 1, further comprising:

a first fitting portion (11e), the first fitting portion (11e) being disposed on the punch support plate (11b) coaxially with the first punch guide hole (11 f); and

a punch guide (35), wherein the punch guide (35) has a second fitting portion (35a) fitted to the first fitting portion (11e) and a second punch guide hole (35b) that slides on the punch (27), and is detachably provided on the front outer side of the punch support plate (11 b).

3. The drilling machine of claim 2,

the second fitting portion (35a) and the first fitting portion (11e) are fitted to each other by clearance fit,

the inclination of the punch (27) is adjusted by the clearance between the first fitting part (11e) and the second fitting part (35 a).

4. Drilling machine according to claim 2 or 3,

the punch support plate (11b) has substantially the same height as the punch guide (35).

5. The drilling machine according to any one of claims 1 to 4,

the punch (27) slides in the first punch guide hole (11 f).

6. The drilling machine according to any one of claims 1 to 5,

further, the device is provided with a feeding motor mounting base (24) which is detachably arranged on the motor supporting part (11c) and is fixed with the feeding motor (25).

7. The drilling machine according to any one of claims 1 to 6,

further has a spline shaft (33b) that is shaft-supported by the motor support portion (11c),

the main shaft (31) has a spline hole (33a) disposed inside the main shaft (31) and engaged with the spline shaft (33b),

the spindle motor (41) is disposed on the motor support portion (11c) and connected to the spline shaft (33b),

the slider (17) has a spline passage hole (17a) through which the spline shaft (33b) passes.

8. The drilling machine of claim 7,

further, the spindle motor mounting base (40) is detachably disposed on the motor support portion (11c) and is fixed with the spindle motor (41).

9. The drilling machine according to any one of claims 1 to 8,

the feed screw (19) has a cylindrical portion (19c) that is disposed coaxially with the screw shaft (19a) at the tip of the screw shaft (19a) and that enables adjustment of the parallelism between the linear guide (15) and the screw shaft (19 a).

10. The drilling machine according to claim 1,

the feed screw (19) has a cylindrical portion (19c) disposed coaxially with the screw shaft (19a) at the tip of the screw shaft (19a) and capable of adjusting the parallelism between the linear guide (15) and the screw shaft (19a),

further comprising:

and an adjustment jig (45) having a third fitting portion (45a) fitted to the first fitting portion (11e) and a fourth fitting portion (45c) fitted to the cylindrical portion (19 c).

11. The drilling machine according to any one of claims 1 to 10,

the punch (27) slides in the first punch guide hole (11 f).

12. The drilling machine according to any one of claims 2 to 11,

the punch (27) is supported by the second punch guide hole (35 b).